Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpg	0.0 ms	197.7 KiB
www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/coral-nursery-grid.jpg	0.0 ms	129.9 KiB
/media/wwwnclacuk/pressoffice/images/news/Lough Neagh GRI...	0.0 ms	119.3 KiB
www.ncl.ac.uk/webtemplate/fonts/fa/fa-solid-900.woff2	0.0 ms	77.6 KiB
www.ncl.ac.uk/webtemplate/css/sites/brand-hub/main.css	0.0 ms	65.0 KiB
www.ncl.ac.uk/webtemplate/fonts/bariol_regular.woff2	0.0 ms	47.0 KiB
from.ncl.ac.uk/hubfs/FromBlog_NewcastleStockholmGlaciers_Header_sm.jpg	1209600.0 s	357.6 KiB
consent.cookiebot.com/uc.js	1050.0 s	35.7 KiB
www.ncl.ac.uk/webtemplate/fonts/derailed-semibold-webfont.woff2	0.0 ms	24.3 KiB
www.ncl.ac.uk/webtemplate/fonts/derailed-bold-webfont.woff2	0.0 ms	24.2 KiB
www.ncl.ac.uk/webtemplate/fonts/derailed-extrabold-webfont.woff2	0.0 ms	24.1 KiB
www.ncl.ac.uk/webtemplate/fonts/derailed-regular-webfont.woff2	0.0 ms	24.0 KiB
www.ncl.ac.uk/webtemplate/img/logos/ncuvision__ncu_logo.svg	0.0 ms	22.6 KiB
www.ncl.ac.uk/webtemplate/js/dist/main/bundle.main-min.js?v=f320929	0.0 ms	12.8 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__slick.min.js	0.0 ms	12.0 KiB
scripts.clarity.ms/0.8.60-beta/clarity.js	86400.0 s	25.0 KiB
static.hotjar.com/c/hotjar-397130.js?sv=7	60.0 s	9.1 KiB
from.ncl.ac.uk/hubfs/FromBlog_WHD26_Header_sm.jpg	1209600.0 s	87.0 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fuse.min.js	0.0 ms	4.1 KiB
www.ncl.ac.uk/webtemplate/img/icons/eurus-icons/eurus-search-icon-blue.png	0.0 ms	3.6 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fastclick.min.js	0.0 ms	2.9 KiB
www.ncl.ac.uk/webtemplate/js/ncuvision__pagination.js	0.0 ms	2.8 KiB
from.ncl.ac.uk/hubfs/New%20Project%20(35)-2.jpg	1209600.0 s	21.5 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__dataLayerEvents.min.js	0.0 ms	1.6 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__niceselect.min.js	0.0 ms	1.5 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fitvids.min.js	0.0 ms	1.1 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__actual.min.js	0.0 ms	1.0 KiB
www.ncl.ac.uk/webtemplate/js/ncuvision__courseNavDisplay.js	0.0 ms	867 B
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__requestAnimationFrame.min.js	0.0 ms	819 B
s.ytimg.com/yts/jsbin/www-widgetapi-vflmgpyWO/www-widgetapi.js	691200.0 s	8.0 KiB
www.ncl.ac.uk/webtemplate/js/dist/lib/codeSplitting.min.js	0.0 ms	711 B
www.ncl.ac.uk/webtemplate/img/icons/ncuvision__menu-open.png	0.0 ms	606 B
www.ncl.ac.uk/webtemplate/img/icons/ncuvision__icon_chevron-right.png	0.0 ms	570 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:58.287 source:map[column:27323 line:2 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:13.024 source:map[column:79427 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:44.985 source:map[column:49615 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]] map[reflowTime:0.278 source:map[column:51395 line:1 type:source-location url:https://code.jquery.com/jquery-3.7.1.min.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
body#htmlbody > main#content > header.header > img.overlayImage `body#htmlbody > main#content > header.header > img.overlayImage`	/prod01/channel_3/mediav8/external-homepage/images/Ancien...	567.3 KiB	511.0 KiB
main#content > section.fullWidthBanner > div.bannerContainer > div.image-overlay `main#content > section.fullWidthBanner > div.bannerContainer > div.image-overlay`	/prod01/channel_3/mediav8/external-homepage/images/promo-...	771.2 KiB	458.7 KiB
A partially submerged glacier set against a blue sky. `div.promoPanelsContainer > div.promo > a > img.hs-featured-image`	from.ncl.ac.uk/hubfs/FromBlog_NewcastleStockholmGlaciers_Header_sm.jpg	356.4 KiB	344.0 KiB
Elite MBAs still influence who reaches top of corporate America image `div.promoPanelsContainer > div.promo > a > img`	www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpg	197.3 KiB	184.8 KiB
Work with us We collaborate with governments, industry, the creative and cultu… `section.dualPanel% > div.panelContainer% > div.row > a.panel-wrapper`	/prod01/channel_3/mediav8/external-homepage/images/dual-h...	173.4 KiB	123.4 KiB
Trait choice and selection key to helping corals survive heatwaves image `div.promoPanelsContainer > div.promo > a > img`	www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/coral-nursery-grid.jpg	129.5 KiB	117.1 KiB
Lough Neagh sand mining threatens lake’s ecosystem, research warns image `div.promoPanelsContainer > div.promo > a > img`	/media/wwwnclacuk/pressoffice/images/news/Lough Neagh GRI...	118.9 KiB	106.5 KiB
A mother holding her child smiles towards the camera against a navy blue backgr… `div.promoPanelsContainer > div.promo > a > img.hs-featured-image`	from.ncl.ac.uk/hubfs/FromBlog_WHD26_Header_sm.jpg	85.6 KiB	77.0 KiB
Global Scholarships Over 1,000 scholarships available for International and EU… `section.dualPanel% > div.panelContainer% > div.row > a.panel-wrapper`	/prod01/channel_3/mediav8/external-homepage/images/dual-s...	101.3 KiB	68.1 KiB
Undergraduate Open Day Explore your future at Newcastle and join us on campus. `section.dualPanel% > div.panelContainer% > div.row > a.panel-wrapper`	/prod01/channel_3/mediav8/study-with-us/general-images/du...	62.6 KiB	29.4 KiB
Illustration of researchers working together across different media `div.promoPanelsContainer > div.promo > a > img.hs-featured-image`	from.ncl.ac.uk/hubfs/New%20Project%20(35)-2.jpg	20.2 KiB	18.1 KiB
div.row > a.promoBanner > div.bannerContainer > div.image-overlay `div.row > a.promoBanner > div.bannerContainer > div.image-overlay`	pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/who-we-are/41068.jpg	43.3 KiB	10.8 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG

nodeLabel: body#htmlbody > main#content > header.header > img.overlayImage

path: 1,HTML,1,BODY,10,MAIN,5,HEADER,2,IMG

selector: body#htmlbody > main#content > header.header > img.overlayImage

snippet: <img class="overlayImage headerHero" src="https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/external-hom…" role="presentation" aria-hidden="true">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.ncl.ac.uk/	http/1.1
www.ncl.ac.uk/webtemplate/fonts/bariol_regular.woff2	http/1.1
www.ncl.ac.uk/webtemplate/fonts/derailed-bold-webfont.woff2	http/1.1
www.ncl.ac.uk/webtemplate/fonts/derailed-extrabold-webfont.woff2	http/1.1
www.ncl.ac.uk/webtemplate/fonts/derailed-semibold-webfont.woff2	http/1.1
www.ncl.ac.uk/webtemplate/fonts/fa/fa-solid-900.woff2	http/1.1
www.ncl.ac.uk/webtemplate/fonts/derailed-regular-webfont.woff2	http/1.1
www.ncl.ac.uk/webtemplate/css/sites/brand-hub/main.css	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/codeSplitting.min.js	http/1.1
www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpg	http/1.1
www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/coral-nursery-grid.jpg	http/1.1
/media/wwwnclacuk/pressoffice/images/news/Lough Neagh GRI...	http/1.1
www.ncl.ac.uk/webtemplate/js/ncuvision__pagination.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fitvids.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__slick.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fuse.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__niceselect.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__requestAnimationFrame.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fastclick.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__actual.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__dataLayerEvents.min.js	http/1.1
www.ncl.ac.uk/webtemplate/js/dist/main/bundle.main-min.js?v=f320929	http/1.1
www.ncl.ac.uk/webtemplate/js/ncuvision__courseNavDisplay.js	http/1.1
www.ncl.ac.uk/webtemplate/img/logos/ncuvision__ncu_logo.svg	http/1.1
www.ncl.ac.uk/webtemplate/img/icons/eurus-icons/eurus-search-icon-blue.png	http/1.1
www.ncl.ac.uk/webtemplate/img/icons/ncuvision__menu-open.png	http/1.1
www.ncl.ac.uk/webtemplate/img/icons/ncuvision__icon_chevron-right.png	http/1.1
www.ncl.ac.uk/favicon.ico	http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
www.ncl.ac.uk/webtemplate/css/sites/brand-hub/main.css	65.0 KiB	1.1 s
www.ncl.ac.uk/webtemplate/js/dist/lib/codeSplitting.min.js	711 B	566 ms
code.jquery.com/jquery-3.7.1.min.js	30.0 KiB	1.1 s

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 875 ms

URL	Time Spent
ncl.ac.uk/	875 ms
www.ncl.ac.uk/	0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 350 ms 71.3 KiB

URL	Transfer Size	Est Savings
www.ncl.ac.uk/webtemplate/css/sites/brand-hub/main.css	64.6 KiB	60.2 KiB
	13.5 KiB	11.1 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.6 s 429.6 KiB

URL	Transfer Size	Est Savings
/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	205.0 KiB	77.6 KiB
/gtag/js?id=AW-777937483&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	165.6 KiB	72.2 KiB
/gtag/js?id=AW-380968450&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	144.2 KiB	65.1 KiB
/gtag/js?id=DC-12430850&cx=c&gtm=4e64h1&sign=97fb0b16cd01...	130.1 KiB	62.6 KiB
metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z	229.0 KiB	61.7 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	56.1 KiB	36.4 KiB
/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/cc.js?renew=false&r...	171.6 KiB	31.3 KiB
consent.cookiebot.com/uc.js	35.4 KiB	22.6 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
consent.cookiebot.com/uc.js	897 ms	428 ms	8.5 ms
code.jquery.com/jquery-3.7.1.min.js	574 ms	273 ms	7.7 ms
Unattributable	538 ms	9.9 ms	0.0 ms
metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z	512 ms	417 ms	56 ms
scripts.clarity.ms/0.8.60-beta/clarity.js	384 ms	335 ms	5.5 ms
/gtag/js?id=AW-380968450&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	381 ms	351 ms	27 ms
www.ncl.ac.uk/	297 ms	12 ms	13 ms
/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	178 ms	138 ms	39 ms
/gtag/js?id=AW-777937483&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	134 ms	103 ms	31 ms
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	131 ms	113 ms	17 ms
/gtag/js?id=DC-12430850&cx=c&gtm=4e64h1&sign=97fb0b16cd01...	103 ms	78 ms	24 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	2.6 s
Other	658 ms
Parse HTML & CSS	476 ms
Style & Layout	393 ms
Script Parsing & Compilation	288 ms
Garbage Collection	146 ms
Rendering	27 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/prod01/channel_3/mediav8/external-homepage/images/promo-...	772.6 KiB
/prod01/channel_3/mediav8/external-homepage/images/Ancien...	568.5 KiB
from.ncl.ac.uk/hubfs/FromBlog_NewcastleStockholmGlaciers_Header_sm.jpg	357.6 KiB
metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z	229.2 KiB
/prod01/channel_3/mediav8/external-homepage/images/ribbon...	215.8 KiB
/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	205.0 KiB
www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpg	197.7 KiB
/prod01/channel_3/mediav8/external-homepage/images/dual-h...	174.1 KiB
/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/cc.js?renew=false&r...	171.9 KiB
/gtag/js?id=AW-777937483&cx=c&gtm=4e64h1&sign=97fb0b16cd0...	165.6 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
Illustration of researchers working together across different media `div.promoPanelsContainer > div.promo > a > img.hs-featured-image`	from.ncl.ac.uk/hubfs/New%20Project%20(35)-2.jpg
A mother holding her child smiles towards the camera against a navy blue backgr… `div.promoPanelsContainer > div.promo > a > img.hs-featured-image`	from.ncl.ac.uk/hubfs/FromBlog_WHD26_Header_sm.jpg
A partially submerged glacier set against a blue sky. `div.promoPanelsContainer > div.promo > a > img.hs-featured-image`	from.ncl.ac.uk/hubfs/FromBlog_NewcastleStockholmGlaciers_Header_sm.jpg
Elite MBAs still influence who reaches top of corporate America image `div.promoPanelsContainer > div.promo > a > img`	www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpg
Trait choice and selection key to helping corals survive heatwaves image `div.promoPanelsContainer > div.promo > a > img`	www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/coral-nursery-grid.jpg
Lough Neagh sand mining threatens lake’s ecosystem, research warns image `div.promoPanelsContainer > div.promo > a > img`	/media/wwwnclacuk/pressoffice/images/news/Lough Neagh GRI...

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 5 user timings

●Avoid long main-thread tasks 15 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 70 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 60 ms

○INP breakdown

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. Learn more about prohibited ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Open Search `div.primary > div.row > div.controls > div.search-toggle`
Open Menu `div.primary > div.row > div.controls > div.menu-toggle`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Elite MBAs still influence who reaches top of corporate America `div.promoPanelsContainer > div.promo > a > h4`
How is Voice® bringing academics, research, and the public together? `div.promoPanelsContainer > div.promo > a > h4`
Newcastle `div.row > div.footerContent > div.footerColumn > h5`

These are opportunities to improve keyboard navigation in your application.

Names and labels

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Search your study level Undergraduate Postgraduate `div.fieldWrapper > div.selectBox > label.wrap > select#courseSelect`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Input buttons have discernible text.

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

●`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z
/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64h1&sign=97fb0b16cd0...

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`